The shoulder allows a wide range of arm movements, which also makes it vulnerable to overuse, tendon problems, stiffness, and injuries. Common causes of shoulder pain include rotator cuff tendonitis or tears, shoulder impingement syndrome, and frozen shoulder. Symptoms can range from an aching sensation to significant restriction of movement. Understanding the potential cause can help guide appropriate treatment, while physiotherapy can focus on restoring mobility, strength, mechanics, and function through personalized rehabilitation.